Road scraper



Dec. 3'0, 1930. E. A. WEEKS ROAD SCRAPER Filed Nov. 7. 192.9

INVENTOR Emwi flv 7kg; W

ATTORNEYS Patented Dec. 39, 1930 ATENT Flfi ERNEST A. WEEKS, OF KALAMAZOO, MICHIGAN, ASSIGNOR TO ROOT SPRINGSCRAl-ER COMPANY, OF KALAMAZOO, MICHIGAN ROAD SGRAPER Application filed November 7, 1929. Serial Ila-405,386.

lVhile this invention has general application it is particularly applicable to scrapers in which the blade is hydraulically controlled and held with strong pressure. The inventlon is acvantageous wherever a yielding scraper blade is desired.

The objects of the invention are:

First, to provide a road scraper with yielding blade which will withstand high pressure,

will readily conform to the road and yield sulhc1ently to passunyielding obstructions.

Second, to provide an improved spring structure for road scraper blades.

Third, to provide such a structure especially designed and intended for use of springs of block rubber.

Objects pertaining to details and economies of construction and operation will delinitely appear from the description to follow.

A preferred embodiment of my invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a side perspective View of my improved scraper shown in position on a truck body, fragments of the truck body only being shown.

Fig. 2 is an enlarged detail fragmentary plan view of one end of the scraper blade structure, taken on section line 22 of Fig.

1, with the scraper blade adjusted to horizontal position.

Fig. 3 is an enlarged end elevation view of the scraper and the scraper rockshaft from the righ hand end of Fig. 1, the scraper beam 5 and hanger being omitted.

Fig. l is a transverse sectional elevation with the scraper in the usual elevated position, taken on line 4-4 of Fig. 2.

Fig. 5 is a detail sectional plan View taken 0 on the oblique lines 55 of Fig. 4:.

The parts will be identified by their numerals of reference.

1 is the chassis or body member of a truck. 2 is the scraper hanger beam or board. This 5 is secured by clamps 21, 21 to segment sup porting bars 22. which are supported by hangers 23 which are bolted, riveted or otherwise secured to the truck body.

The hanger board is centrally pivoted and a is preferably provided with a hydraulic cylinder 3 for operation/ l are hangers on the hanger boardQ. 5 is the scraper roclrshaft disposed in hearings in said hangers l. This recszshaft is connected in any well-known manner to be operated by the hydraulic cylinder 3, the details not being shown.

6 is the scraper blade carried by a series of arms 7 having spaced cars 71 with bearings on the rockshaft 5. 'Roclrshaft arms 8 are secured by collars 9 which are disposed between the parallel ears 71 of each arm and are bolted to the rockshaft 5 by bolts 10. The arms 7 are provided with flat extensions 72 which are disposed exactly opposite the roclrshaft arms 8. Between the rockshaft arms 8 and the extensions 72 are disposed the springs of soft block rubber 11, one being provided for each arm and being retained by'bolt 12 disposed through the roclrshaft arm and the said plate 72 as seen in Fig. l. hen the rockshaft 5' is operated to turn the scraper 6 down to its work, it acts on the scraper through the ,rockshaft' arms 8, which maybe properly called actuating arms, compressing the spring blocks 11 against the flat plates '72 and forcing the scraper blade 6 down to its work. It will be seen that when the scraper encounters an obstruction the block rubber springs'll will be compressed and the blade can yield to some extent as a consequence. p 7

V Coil return springs 13 at each end of the rockshaft 5 and connected to the shaft by the adjustable collars 14, are connected to the beams 2 for returning the scraper to the elevated position when the pressure in the hydraulic cylinder 3 is released.

These counterbalance springs will be of advantage no matter What means are employed for applying pressure to'the scraper, but they are of especial consequence with the hydraulic structure.

I have shown my improved spring structure exactly in the form which I prefer, em-

ploying springs of block rubber which are of a special advantagein this relation because not liable to breakage. Other varieties of springs might be used in this relation.

I desire to claim the invention specifically and also broadly as pointed out in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination of a truck body, an adjusting scraper hanger beam supported thereon, a scraper rockshat't in suitable hangers on said beam, means for actuating the said rockshatt, a counterspring for returning the same, ascraper blade, arms for carrying the same pivoted by pairs of ears to the said rockshaft and having flat portions projecting above and beyond the said rcclrshaft, rockshaft arms disposed opposite the said flat portions of said scraper arms and having collars disposed between said ears and fixed on the said rockshaft, springs of block rubber interposed between the said rockshaft arms and flat portions of the scraper arms, and clamping bolts through the centers of said springs to retain them in position.

2. A scraper rockshatt, means vtor supporting the same, a scraper blade, arms for carrying the same pivoted by pairs of ears to the said rockshatt and having flat portions projecting above and beyond the said rockshaft, rockshaft arms disposed opposite the said flat portions of said scraper arms and having collars disposed between the said ears and fixed on the said rockshaft, springs of block rubber interposed between the said rockshaft arms and flat portions oi the scraper arms, and clamping bolts through the centers of said springs to retain them in position.

3. A scraper rockshaft, means for supporting the same, a scraper blade, arms for carrying the same pivoted by pairs of cars to the said rockshaft and having flat portions projecting above and beyond the said rockshaft, rockshaft arms disposed opposite the said flat portions of said scraper arms and having collars disposed between the said ears and fixed on the said rockshaft, springs interposed between the said rockshaft arms and fiat portions of the scraper arms, and means to retain them in position.

4. In a scraper structure, the combination of a rocksha ft, means for supporting the same, a scraper blade, arms for carrying said blade with suitable bearings on said shaft, corresponding rockshaft arms secured to the said shaft, springs of block rubber interposed between said rockshaft arms and the said scraper arms, so disposed that said springs are compressed when pressure is applied to the scraper.

5. In a scraper structure, the combination of a scraper rockshaft, a scraper blade, connection therefrom to the rockshai't comprising a scraper arm with spaced ears having,

bearing on the said shaft, a rockshaft arm with connecting hub fixed to the said shaft between said ears, and a spring of block rubber interposed betweensaid rockshaft arm and said scraper arm.

6. In a scraper structure, the combination of a scraper, a rockshaft having pivoted sup porting arms therefor, actuating arms for the said scraper arms, and springs of block rubber interposed between the said actuating arms and the scraper arms.

In witness whereof I have hereunto set my hand.

ERNEST A. WEEKS. 

